Open Shortest Path First (OSPF) Multi-Topology Routing2007-06-042013-05-28Multi-Topology ID Values0-2ReservedIANA does not assign3-31IETF consensus32-127ReservedIANA does not assign128-255ReservedIANA does not assign0Reserved for advertising the metric associated
with the default topology (see Section 4.2)1Reserved for advertising the metric associated
with the default multicast topology2Reserved for IPv4 in-band management purposes3-31Unassigned32-127Reserved for development, experimental and
proprietary features128-255Invalid and SHOULD be ignored